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/**

* Examples from Chapter 2.

public class Variables {

public static void main(String[] args) {

String message;

int x;

String firstName;

String lastName;

int hour, minute;

message = "Hello!"; // give message the value "Hello!"

hour = 11; // assign the value 11 to hour

minute = 59; // set minute to 59

message = "123"; // legal

// message = 123; // not legal

String message2 = "Hello!";

int hour2 = 11;

int minute2 = 59;

int a = 5;

int b = a; // a and b are now equal

a = 3; // a and b are no longer equal

String firstLine = "Hello, again!";

System.out.println(firstLine);

System.out.print("The value of firstLine is ");

System.out.println(firstLine);

System.out.print("The current time is ");

System.out.print(hour);

System.out.print(":");

System.out.print(minute);

System.out.println(".");

System.out.print("Number of minutes since midnight: ");

System.out.println(hour * 60 + minute);

System.out.print("Fraction of the hour that has passed: ");

System.out.println(minute / 60);

System.out.print("Percent of the hour that has passed: ");

System.out.println(minute * 100 / 60);

double pi;

pi = 3.14159;

double minute3 = 59.0;

System.out.print("Fraction of the hour that has passed: ");

System.out.println(minute3 / 60.0);

double y = 1.0 / 3.0; // correct

System.out.println(0.1 * 10);

System.out.println(0.1 + 0.1 + 0.1 + 0.1 + 0.1

+ 0.1 + 0.1 + 0.1 + 0.1 + 0.1);

double balance = 123.45; // potential rounding error

int balance2 = 12345; // total number of cents

System.out.println(1 + 2 + "Hello");

// the output is 3Hello

System.out.println("Hello" + 1 + 2);

// the output is Hello12

System.out.println(17 * 3);

System.out.println(hour * 60 + minute);

int percentage;

percentage = (minute * 100) / 60;

hour = minute + 1; // correct

// minute + 1 = hour; // compiler error

}